The three main sections of this code are for controlling the NeoPixels, using the MCP23017's, and sending serial commands to the Bluefruit EZ-Key.
You can find all of the code documented below.
To reference the tables I used for the serial commands, should you want to adapt the code for some other use, go to the wonderfully table-y page below.
//Written by Timothy Reese, October 11th, 2015.
//This code is a mix of Adafruit examples and my own customization.
// Connect pin #12 of the expander to Analog 5 (i2c clock)
// Connect pin #13 of the expander to Analog 4 (i2c data)
// Connect pins #15, 16 and 17 of the expander to ground (address selection)
// Connect pin #9 of the expander to 5V (power)
// Connect pin #10 of the expander to ground (common ground)
// Connect pin #18 through a ~10kohm resistor to 5V (reset pin, active low)
// Input #0 is on pin 21 so connect a button or switch from there to ground
#include <Wire.h>
#include "Adafruit_MCP23017.h"
#include <SoftwareSerial.h>
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
Adafruit_MCP23017 mcp0;
Adafruit_MCP23017 mcp1;
Adafruit_MCP23017 mcp2;
#define PIN 6 // for the NeoPixel data line.
Adafruit_NeoPixel strip = Adafruit_NeoPixel(14, PIN, NEO_GRB + NEO_KHZ800);
SoftwareSerial BT(4,3); //RX, and then TX. These are not your hardware serials, don't get them confused or gibberish will ensue on boot.
void setup() {
Serial.begin(9600);
BT.begin(9600);
mcp0.begin(0); // use default address 0
mcp1.begin(1); // use address 1
mcp2.begin(2); // use address 2
strip.begin();
strip.show(); // Initialize all pixels to 'off'
// This could probably be an array
mcp0.pinMode(0, INPUT);
mcp0.pullUp(0, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(1, INPUT);
mcp0.pullUp(1, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(2, INPUT);
mcp0.pullUp(2, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(3, INPUT);
mcp0.pullUp(3, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(4, INPUT);
mcp0.pullUp(4, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(5, INPUT);
mcp0.pullUp(5, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(6, INPUT);
mcp0.pullUp(6, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(7, INPUT);
mcp0.pullUp(7, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(8, INPUT);
mcp0.pullUp(8, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(9, INPUT);
mcp0.pullUp(9, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(10, INPUT);
mcp0.pullUp(10, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(11, INPUT);
mcp0.pullUp(11, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(12, INPUT);
mcp0.pullUp(12, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(13, INPUT);
mcp0.pullUp(13, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(14, INPUT);
mcp0.pullUp(14, HIGH); // turn on a 100K pullup internally
mcp0.pinMode(15, INPUT);
mcp0.pullUp(15, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(0, INPUT);
mcp1.pullUp(0, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(1, INPUT);
mcp1.pullUp(1, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(2, INPUT);
mcp1.pullUp(2, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(3, INPUT);
mcp1.pullUp(3, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(4, INPUT);
mcp1.pullUp(4, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(5, INPUT);
mcp1.pullUp(5, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(6, INPUT);
mcp1.pullUp(6, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(7, INPUT);
mcp1.pullUp(7, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(8, INPUT);
mcp1.pullUp(8, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(9, INPUT);
mcp1.pullUp(9, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(10, INPUT);
mcp1.pullUp(10, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(11, INPUT);
mcp1.pullUp(11, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(12, INPUT);
mcp1.pullUp(12, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(13, INPUT);
mcp1.pullUp(13, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(14, INPUT);
mcp1.pullUp(14, HIGH); // turn on a 100K pullup internally
mcp1.pinMode(15, INPUT);
mcp1.pullUp(15, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(0, INPUT);
mcp2.pullUp(0, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(1, INPUT);
mcp2.pullUp(1, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(2, INPUT);
mcp2.pullUp(2, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(3, INPUT);
mcp2.pullUp(3, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(4, INPUT);
mcp2.pullUp(4, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(5, INPUT);
mcp2.pullUp(5, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(6, INPUT);
mcp2.pullUp(6, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(7, INPUT);
mcp2.pullUp(7, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(8, INPUT);
mcp2.pullUp(8, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(9, INPUT);
mcp2.pullUp(9, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(10, INPUT);
mcp2.pullUp(10, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(11, INPUT);
mcp2.pullUp(11, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(12, INPUT);
mcp2.pullUp(12, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(13, INPUT);
mcp2.pullUp(13, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(14, INPUT);
mcp2.pullUp(14, HIGH); // turn on a 100K pullup internally
mcp2.pinMode(15, INPUT);
mcp2.pullUp(15, HIGH); // turn on a 100K pullup internally
// pinMode(13, OUTPUT); // use the p13 LED as debugging
}
// For the Raw HID commands, here's the function.
void keyCommand(uint8_t modifiers, uint8_t keycode1, uint8_t keycode2 = 0, uint8_t keycode3 = 0,
uint8_t keycode4 = 0, uint8_t keycode5 = 0, uint8_t keycode6 = 0) {
BT.write(0xFD); // our command
BT.write(modifiers); // modifier!
BT.write((byte)0x00); // 0x00
BT.write(keycode1); // key code #1
BT.write(keycode2); // key code #2
BT.write(keycode3); // key code #3
BT.write(keycode4); // key code #4
BT.write(keycode5); // key code #5
BT.write(keycode6); // key code #6
}
void loop() {
// The LED will 'echo' the button - used for debugging.
// digitalWrite(13, mcp0.digitalRead(0));
//NeoPixel Arcade Button Colors
strip.setPixelColor(0, 255, 165, 0);
strip.setPixelColor(1, 255, 165, 0);
strip.setPixelColor(2, 255, 165, 0);
strip.setPixelColor(3, 255, 165, 0);
strip.setPixelColor(4, 255, 165, 0);
strip.setPixelColor(5, 255, 165, 0);
strip.setPixelColor(6, 255, 0, 0);
strip.setPixelColor(7, 255, 0, 0);
strip.setPixelColor(8, 255, 0, 0);
strip.setPixelColor(9, 255, 0, 0);
strip.setPixelColor(10, 255, 0, 0);
strip.setPixelColor(11, 255, 0, 0);
strip.setPixelColor(12, 255, 0, 0);
strip.setPixelColor(13, 255, 165, 0);
strip.show();
// All keyCommands are from the Raw HID Keyboard Reports section, and you just count up from 4,
//starting at 4 on the list. So "B" would be a 5.
// Likewise "I" would be a 12.
// The BT.write commands are using the Hex values for ASCII.
// I've included both because I used both while writing the original code, and also so you can
//pick and choose if you wish to use it for another project.
//Preview 1
if (mcp0.digitalRead(0) == LOW) {
Serial.println("Success Preview 1!");
keyCommand(0,30);
strip.setPixelColor(6, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Preview 2
if (mcp0.digitalRead(1) == LOW) {
Serial.println("Success Preview 2!");
keyCommand(0,31);
strip.setPixelColor(7, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Preview 3
if (mcp0.digitalRead(2) == LOW) {
Serial.println("Success Preview 3!");
keyCommand(0,32);
strip.setPixelColor(8, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Preview 4
if (mcp0.digitalRead(3) == LOW) {
Serial.println("Success Preview 4!");
keyCommand(0,33);
strip.setPixelColor(9, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Preview 5
if (mcp0.digitalRead(4) == LOW) {
Serial.println("Success Preview 5!");
keyCommand(0,34);
strip.setPixelColor(10, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Preview 6
if (mcp0.digitalRead(5) == LOW) {
Serial.println("Success Preview 6!");
keyCommand(0,35);
strip.setPixelColor(11, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Auto Transition (Space)
if (mcp0.digitalRead(6) == LOW) {
Serial.println("Success Auto Transition!");
keyCommand(0,44);
strip.setPixelColor(12, 255, 255, 255);
strip.show();
delay(250);
keyCommand(0,0);
}
//Prog 1
if (mcp0.digitalRead(7) == LOW) {
Serial.println("Success F1!");
BT.write(0x0F);
strip.setPixelColor(5, 255, 255, 255);
strip.show();
delay(250);
}
//Prog 2
if (mcp0.digitalRead(8) == LOW) {
Serial.println("Success F2!");
BT.write(0x10);
strip.setPixelColor(4, 255, 255, 255);
strip.show();
delay(250);
}
//Prog 3
if (mcp0.digitalRead(9) == LOW) {
Serial.println("Success F3!");
BT.write(0x11);
strip.setPixelColor(3, 255, 255, 255);
strip.show();
delay(250);
}
//Prog 4
if (mcp0.digitalRead(10) == LOW) {
Serial.println("Success F4!");
BT.write(0x12);
strip.setPixelColor(2, 255, 255, 255);
strip.show();
delay(250);
}
//Prog 5
if (mcp0.digitalRead(11) == LOW) {
Serial.println("Success F5!");
BT.write(0x13);
strip.setPixelColor(1, 255, 255, 255);
strip.show();
delay(250);
}
//Prog 6
if (mcp0.digitalRead(12) == LOW) {
Serial.println("Success F6!");
BT.write(0x14);
strip.setPixelColor(0, 255, 255, 255);
strip.show();
delay(250);
}
//Cut (enter)
if (mcp0.digitalRead(13) == LOW) {
Serial.println("Success Cut!");
BT.write(0x0A);
strip.setPixelColor(13, 255, 255, 255);
strip.show();
delay(250);
}
// Record (home)
if (mcp0.digitalRead(14) == LOW) {
Serial.println("Success Record!");
BT.write(0x02);
delay(250);
}
// Go Live (end)
if (mcp0.digitalRead(15) == LOW) {
Serial.println("Success Go Live!");
BT.write(0x05);
delay(250);
}
// Edit Media 1 (z)
if (mcp1.digitalRead(0) == LOW) {
Serial.println("Success Edit Media 1!");
BT.write(0x7A);
delay(250);
}
// Edit Graphic 1 (q)
if (mcp1.digitalRead(1) == LOW) {
Serial.println("Success Edit Graphic 1!");
BT.write(0x71);
delay(250);
}
// Edit Graphic 2 (w)
if (mcp1.digitalRead(2) == LOW) {
Serial.println("Success Edit Graphic 2!");
BT.write(0x77);
delay(250);
}
// Edit Graphic 3 (e)
if (mcp1.digitalRead(3) == LOW) {
Serial.println("Success Edit Graphic 3!");
BT.write(0x65);
delay(250);
}
// Go to Start (g)
if (mcp1.digitalRead(4) == LOW) {
Serial.println("Success Go to Start!");
BT.write(0x67);
delay(250);
}
// Play/Pause (k)
if (mcp1.digitalRead(5) == LOW) {
Serial.println("Success Play/Pause!");
BT.write(0x6b);
delay(250);
}
// Go to End (')
if (mcp1.digitalRead(6) == LOW) {
Serial.println("Success Go to End!");
BT.write(0x27);
delay(250);
}
// Edit Media 2 (x)
if (mcp1.digitalRead(7) == LOW) {
Serial.println("Success Edit Media 2!");
BT.write(0x78);
delay(250);
}
// Edit Audio (a)
if (mcp1.digitalRead(8) == LOW) {
Serial.println("Success Edit Audio!");
BT.write(0x61);
delay(250);
}
// Edit Stream (s)
if (mcp1.digitalRead(9) == LOW) {
Serial.println("Success Edit Stream!");
BT.write(0x73);
delay(250);
}
// Edit Transition (d)
if (mcp1.digitalRead(10) == LOW) {
Serial.println("Success Edit Transition!");
BT.write(0x64);
delay(250);
}
// Go to In (u)
if (mcp1.digitalRead(11) == LOW) {
Serial.println("Success Go to In!");
BT.write(0x75);
delay(250);
}
// Set In (i)
if (mcp1.digitalRead(12) == LOW) {
Serial.println("Success Set In!");
BT.write(0x69);
delay(250);
}
// Set Out (o)
if (mcp1.digitalRead(13) == LOW) {
Serial.println("Success Set Out!");
BT.write(0x6F);
delay(250);
}
// Graphics 1 Preview (Numpad 1)
if (mcp1.digitalRead(14) == LOW) {
Serial.println("Success Graphics 1 Preview!");
keyCommand(0,89);
delay(250);
keyCommand(0,0);
}
// Graphics 2 Preview (Numpad 2)
if (mcp1.digitalRead(15) == LOW) {
Serial.println("Success Graphics 2 Preview!");
keyCommand(0,90);
delay(250);
keyCommand(0,0);
}
// Graphics 3 Preview (Numpad 3)
if (mcp2.digitalRead(0) == LOW) {
Serial.println("Success Graphics 3 Preview!");
keyCommand(0,91);
delay(250);
keyCommand(0,0);
}
// Graphics 1 Push (Numpad 4)
if (mcp2.digitalRead(1) == LOW) {
Serial.println("Success Graphics 1 Push!");
keyCommand(0,92);
delay(250);
keyCommand(0,0);
}
// Graphics 2 Push (Numpad 5)
if (mcp2.digitalRead(2) == LOW) {
Serial.println("Success Graphics 2 Push!");
keyCommand(0,93);
delay(250);
keyCommand(0,0);
}
// Graphics 3 Push (Numpad 6)
if (mcp2.digitalRead(3) == LOW) {
Serial.println("Success Graphics 3 Push!");
keyCommand(0,94);
delay(250);
keyCommand(0,0);
}
// Graphics 1 Pull (Numpad 7)
if (mcp2.digitalRead(4) == LOW) {
Serial.println("Success Graphics 1 Pull!");
keyCommand(0,95);
delay(250);
keyCommand(0,0);
}
// Graphics 2 Pull (Numpad 8)
if (mcp2.digitalRead(5) == LOW) {
Serial.println("Success Graphics 2 Pull!");
keyCommand(0,96);
delay(250);
keyCommand(0,0);
}
// Graphics 3 Pull (Numpad 9)
if (mcp2.digitalRead(6) == LOW) {
Serial.println("Success Graphics 3 Pull!");
keyCommand(0,97);
delay(250);
keyCommand(0,0);
}
}
//This is a breakdown of the Function Commands via Hex,
//since they're not spelled out on the Bluefruit guide.
//0x0F = F1
//0x10 = F2
//0x11 = F3
//0x12 = F4
//0x13 = F5
//0x14 = F6
//0x15 = F7
//0x16 = F8
//0x17 = F9
//0x18 = F10
//0x19 = F11
//0x1A = F12
// https://learn.adafruit.com/introducing-bluefruit-ez-key-diy-bluetooth-hid-keyboard/sending-keys-via-serial
// http://www.instructables.com/id/different-ways-to-count/
